Question

formation of igneous rocks
magma ______ either underground or on the surface and ____ into an igneous rock. as the magma cools, different crystals form at different temperatures, undergoing ______.
crystallization is the process of ______ as molten rocks cool down and solidify. the ______ of cooling determines how much time the crystals will have to form.
slow cooling magma produces ______ crystals. fast cooling magma produces ____ igneous rocks. sometimes, the cooling is so ______ as to prevent the formation of even small crystals,
cooling and crystallizing
silicate liquid (original)
growing crystals
diagrams 1–6, with 6 labeled network of intergrown crystals: all magma used up

Explanation:

To solve the fill - in - the - blanks about the formation of igneous rocks, we rely on the knowledge of geology (a sub - field of Natural Science, specifically Earth Science which is related to Geography in the given sub - fields).

Step 1: Analyze the first part of the "Formation of Igneous Rocks" paragraph

Magma cools either underground or on the surface and solidifies into an igneous rock. As the magma cools, different crystals form at different temperatures, undergoing crystallization.

• Explanation for "cools": Magma is in a molten state. For it to form a rock, the first step is the reduction of its temperature, which is described by the process of cooling.
• Explanation for "solidifies": After cooling, the molten magma changes its state from liquid to solid, and this process is called solidification, which results in the formation of igneous rock.
• Explanation for "crystallization": When magma cools, the minerals within it start to form crystals, and this overall process of crystal formation is known as crystallization.

Step 2: Analyze the "Crystallization" paragraph

Crystallization is the process of forming crystals as molten rocks cool down and solidify. The rate of cooling determines how much time the crystals will have to form.

• Explanation for "forming crystals": By definition, crystallization is the process where crystals are created as the molten rock (magma or lava) cools and becomes solid.
• Explanation for "rate": The speed at which the cooling occurs (the rate of cooling) dictates the amount of time available for crystals to grow. A slow rate gives more time, and a fast rate gives less time.

Step 3: Analyze the last paragraph

Slow cooling magma produces large crystals. Fast cooling magma produces fine - grained (or small - crystal - sized) igneous rocks. Sometimes, the cooling is so rapid as to prevent the formation of even small crystals.

• Explanation for "large": When magma cools slowly, the crystals have a long time to grow, so they can become relatively large in size.
• Explanation for "fine - grained (or small - crystal - sized)": In the case of fast cooling, the crystals do not have enough time to grow to a large size. So, the resulting igneous rocks have small crystals, and the rock is described as fine - grained.
• Explanation for "rapid": If the cooling is extremely fast (rapid), there is almost no time for crystals to form at all.

Answer:

s for the blanks (in order):

1. cools
2. solidifies
3. crystallization
4. forming crystals
5. rate
6. large
7. fine - grained (or small - crystal - sized)
8. rapid